JPH0420736B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for modifying an NC program for a 4-axis lathe, and particularly includes a waiting command corresponding to each of two tool rests, a first and a second turret. 1st, 2nd
The present invention relates to a method for modifying an NC program for a 4-axis lathe in which a workpiece is machined by independently controlling the movement of corresponding tool rests using a first and second NC program while synchronizing with the waiting command.

<Prior art> In a four-axis lathe with two tool rests, each tool rest can be controlled and moved independently, so for example, the tool 12 attached to one tool rest 11 (see Fig. 4) can be moved. This has the advantage that the outer diameter machining of the workpiece 13 and the inner diameter machining can be simultaneously performed using the tool 22 attached to the other tool post 21, and the machining time can be shortened.

However, when machining is performed with two tool rests 11 and 21 at the same time, two tool rests (including tools) are used.
Conflicts may occur due to errors in program commands. Since such collisions must be avoided at all costs, it has traditionally been necessary to check whether the two turrets will collide before actual machining (called a turret interference check). First and second NC provided
I am trying to modify the program.

Incidentally, a tool post interference check to determine whether two tool posts will collide has conventionally been performed using the following method.

That is, for all the tools attached to each tool post, the shapes of the tools 12, 22 and the tool posts 11, 21 are defined (approximated) as rectangular areas as shown by dotted lines in FIG. It checks whether rectangles overlap, and if they overlap, it is assumed that they interfere. The reason why it is defined as a rectangle in this way is that it is relatively easy to perform calculations to check whether rectangles overlap, and it is preferable to check whether figures that match the actual shapes overlap. is complicated and unrealistic. However, recently, the actual shape of each tool is input into an NC device, and it is checked whether the shapes overlap. This is because CNC machines are increasingly being equipped with CRTs that can display color graphics, so each tool can be displayed in a different color, and two
This is because tool interference can be easily checked based on whether two color displays overlap.

<Problem to be solved by the invention> Now, when tool interference occurs, the NC program must be modified to prevent the interference, but in the past, it was not possible to automatically modify the NC program. For this reason, there was a problem in that it became troublesome for employees to make corrections, and it took a long time to make corrections.

From the above, it is an object of the present invention to avoid interference.
An object of the present invention is to provide a correction method that can automatically correct an NC program for an axis lathe.

<Means to solve the problem> FIG. 1 is an explanatory diagram of the present invention.

101 and 102 are first and second NC programs provided corresponding to the first and second tool rests, 301 is a CNC device, and 401 is a graphic display device.

102, 202 is a decoding/execution data creation unit, 1
03,203 is an interpolation simulator, 104,20
4,301a is a storage area.

<Operation> In the interference check, the interpolation simulators 103 and 104 execute interpolation simulation one block at a time based on the first and second NC programs 101 and 102, and when interference occurs, the interpolation simulation is stopped and the interpolation simulation is stopped. Move the turret backwards until you reach the beginning of the block.

After that, while the interpolation simulation by one NC program is stopped, the interpolation simulation by the other NC program is executed to move the other tool rest independently along the interference block, and if there is no interference during independent movement, The block numbers N and M of the first and second NC programs that interfered are stored in the storage area 301a, respectively.

After the interference check, a wait command is inserted before the block number M of the NC program where the interpolation simulation was stopped,
The NC program is modified by inserting a wait command after the block with block number N _B of the NC program in which the interpolation simulation was executed.

<Example> FIG. 1 is an explanatory diagram of the present invention.

101 and 201 are first and second NC programs provided corresponding to the first and second two tool rests, 301 is a CNC device, and 401 is a graphic display device with an interference check function.

102, 202 is a decoding/execution data creation unit that reads and decodes the NC program one block at a time, and creates data in executable format; 103;
203 is an interpolation simulator; 104 and 204 are storage areas for storing the latest path data for several blocks together with block numbers (sequence numbers);
1a is an interfering block storage area that stores the sequence numbers of interfering blocks. Note that the elements in the 100s are for controlling the movement of the first tool rest, and the elements in the 200s are for controlling the movement of the second tool rest.

The graphic display device 401 draws both tools in different colors and determines whether the first and second tools overlap. For example, if the first turret and tool are drawn in blue and the second turret and tool are drawn in green, "1" is simultaneously drawn from the blue frame memory and the green frame memory.
When is read out, it is determined that both tools overlap.

FIG. 2 is a flow chart of the process of the NC program correction method for a four-axis lathe according to the present invention. The process will be explained below according to this flowchart.

(1) When started, the NC programs 101 and 102 of each tool post are read one block at a time, decoded, and converted into executable data.

Incidentally, if the NC data is the program end or tape end, the interference check process is ended and the correction process described later is executed.

(2) Executable data is stored in storage areas 104 and 204, respectively, called block data memories. Note that this storage area stores the sequence number as well as the execution format data.

(3) Each interpolation simulation 103, 203 executes an interpolation simulation using the data in the executable format, and sends the result to the graphic display device 401.

(4) The graphic display device 401 moves and draws each tool in a different color based on the interpolated data. The graphic display device also checks whether the two tools interfere.

(5) If there is no interference, check whether the interpolation simulation for one block has finished, and if it has not finished, perform the processing from step (3) onwards.
If completed, the process from step (1) onwards is repeated based on the NC data of the next block.

(6) On the other hand, in step (4), if the tool interferes, the interpolation simulators 103 and 203 stop interpolation. Note that the sequence number of the first NC program at the time of interference is N, and the sequence number of the second NC program is M.

After that, each tool position and the starting point position of the interference block (storage areas 104 and 20) are stored when interpolation is stopped.
4) is used to move the double turret back to the starting position of the interference block.

(7) After completing the backward movement, only the interpolation simulator 103 (or the interpolation simulator 203) performs interpolation simulation based on the path data of the interference block, and moves the first tool rest independently along the interference block.

(8) The graphic display device 401 checks whether it interferes with the individual movement.

(9) If there is no interference, check whether independent movement along the interference block has been completed. If the independent movement is not completed, the processing from step (7) onwards is continued.

(10) If the independent movement is completed without interference, store N and M in the interference block storage area 301a,
After that, simultaneous movement control will start. Note that the path of the first tool rest is controlled based on the next NC data, and the path of the second tool rest is controlled based on the latest path data stored in the storage area 204.

(11) If there is interference in step (8), I+1→I (where I is the number of interferences and is cleared to 0 by the rendezvous command).

(12) Next, check whether I≧I _s . However, I _s is the number of times of interference allowed from one rendezvous command to the next rendezvous command.

(13) If I≧I _s , it is inappropriate to control the 4-axis lathe using the first and second NC programs, and this fact is displayed and the process ends.

(14) However, if I<I _s , then N-1→N,M
1 from the block that actually interfered as -1→M
The previous block is regarded as an interfering block, and the processing from step (6) onwards is repeated.

As described above, when the interference check is completed, the first and second NC programs are corrected using the sequence numbers stored in the interference block storage area 301a.

(a) 2nd NC with interpolation simulation stopped;
Insert a wait command before the block with sequence number M in the program; (b) Correct the NC program by inserting a wait command after the block with sequence number N in the NC program that executed the interpolation simulation.

For example, the 1st NC program and the 2nd NC program are configured as follows. 1st NC program 2nd NC program …………………… …………………… N1100M100; N2100M100; N1101G00X Z S M03;
N2101G00X Z ; N1102G01X F ; N2102G01Z F ; N1103G00Z ; N2103G00X ；N1104X ；N2104Z ; N1105G01Z ; N2105G01X ；N1106X ；N2106Z ; …………… …………… N1200M200; N2200M200; (However, M100 and M200 are waiting commands), as shown in Figure 3, the sequence number N1102 of the first NC program and the sequence number N2102 of the second NC program If it interferes with the movement of
The NC program is modified as follows.

1st NC program 2nd NC program …………………… …………………… N1100M100; N2100M100; N1101G00X Z S M03;
N2101G00X Z ; N1102G01X F ; N2102M300; N1103M300; N2103G01Z F; N1104G00Z; N2104G00X ；N1105X ；N2105Z ; N1106G01Z ；N2106G01X ；N1107X ；N2107Z ; …………… …………… N1200M200; N2200M200; In addition, the above example is a case where the motor is moved independently using one of the predetermined NC programs after completing the reverse movement, but which interpolation simulation is executed? It may be determined by considering the type of machining of the tool rest. For example, an NC program may be determined to stop the interpolation simulation under conditions such as giving priority to inner diameter machining over end face machining and outer diameter machining.

<Effects of the Invention> According to the present invention, in the interference check,
If there is interference, stop the interpolation simulation and move both tool rests backwards to the beginning of the block that interfered, then stop the interpolation simulation by one NC program and move the other one.
Execute interpolation simulation using the NC program to move the other turret independently, and if there is no interference during independent movement, the first and second NCs that interfered
The block numbers N and M of the program are memorized, and a wait command is inserted before the block number M of the NC program where the interpolation simulation was stopped after the interference check, and the block number N of the NC program where the interpolation simulation was executed is stored. Since the configuration is configured to modify the NC program by inserting a wait command later, it is possible to automatically modify the NC program for a 4-axis lathe to avoid interference, and the modification process can be performed easily in a short time. can.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram of the present invention, Fig. 2 is a flowchart of the processing of the present invention, Fig. 3 is an explanatory diagram of program correction in case of interference, Fig. 4 is an explanatory diagram of a 4-axis lathe, and Fig. 5 is an explanatory diagram of a 4-axis lathe. FIG. 3 is an explanatory diagram of a tool interference check. 101,201...First and second NC programs, 102,202...Decoding/execution data creation section, 103,203...Interpolation simulator, 10
4,204...Storage area, 301a...Interference block storage area, 301...CNC device, 401...Graphic display device.

Claims (1)

[Claims] 1. First and second NC programs each having a waiting command are provided corresponding to the first and second two tool rests, and the first and second NC programs are synchronized by the waiting command. In the method for modifying an NC program for a 4-axis lathe that processes a workpiece by controlling the movement of the corresponding tool rest independently using the 2nd NC program, when checking for interference, 1 block is sequentially changed based on the 1st and 2nd NC programs. While executing the interpolation simulation one by one, it checks whether the tools on the first and second tool posts interfere with each other, and if they do, it stops the interpolation simulation and moves both tool posts up to the beginning of the block that interfered. Then, while the interpolation simulation by one NC program is stopped, the interpolation simulation by the other NC program is executed to move the other tool rest independently along the interference block, so that it does not interfere when moving independently. If so, the block numbers of the first and second NC programs that interfered are memorized, and after checking the interference, a wait command is inserted before the block number of the NC program where the interpolation simulation was stopped, and the interpolation simulation is restarted. A method for modifying an NC program for a 4-axis lathe, characterized in that the NC program is modified by inserting a waiting command after the block number of the NC program that has executed. 2. If there is interference during the independent movement, consider the block immediately before the interfering block as the interfering block, and move the double turret backwards to the starting point of the block;
2. The method of modifying an NC program for a four-axis lathe according to claim 1, wherein the independent movement control is then performed.